<template>
  <div class="cart-box">
    <s-header name="购物车" />
    <div class="cart-body">
      <van-checkbox-group
        @change="groupChange"
        v-model="result"
        ref="checkboxGroup"
      >
        <van-swipe-cell
          :right-width="50"
          v-for="(item, index) in list"
          :key="index"
        >
          <div class="good-item">
            <van-checkbox :name="item.cartItemId" />
            <div class="good-img">
              <img :src="$filters.prefix(item.goodsCoverImg)" alt="" />
            </div>
            <div class="good-desc">
              <div class="good-title">
                <span>{{ item.goodsName }}</span>
                <span>x{{ item.goodsCount }}</span>
              </div>
              <div class="good-btn">
                <div class="price">¥{{ item.sellingPrice }}</div>
                <van-stepper
                  integer
                  :min="1"
                  :max="5"
                  :model-value="item.goodsCount"
                  :name="item.cartItemId"
                  async-change
                  @change="onChange"
                />
              </div>
            </div>
          </div>
          <template #right>
            <van-button
              square
              icon="delete"
              type="danger"
              class="delete-button"
              @click="deleteGood(item.cartItemId)"
            />
          </template>
        </van-swipe-cell>
      </van-checkbox-group>
    </div>
    <van-submit-bar
      v-if="list.length > 0"
      class="submit-all"
      :price="total * 100"
      button-text="结算"
      @submit="onSubmit"
    >
      <van-checkbox @click="allCheck" v-model:checked="checkAll"
        >全选</van-checkbox
      >
    </van-submit-bar>
    <div class="empty" v-if="!list.length">
      <img
        class="empty-cart"
        src="//s.yezgea02.com/1604028375097/empty-car.png"
        alt="空购物车"
      />
      <div class="title">购物车空空如也</div>
      <van-button round color="#1baeae" type="primary" @click="goTo" block
        >前往选购</van-button
      >
    </div>
    <nav-bar />
  </div>
</template>

<script>
import { computed, onMounted, reactive, toRefs } from "vue";
import navBar from "../components/NavBar/index";
import sHeader from "../components/simpleHeader";
import { Toast } from 'vant';
import { deleteCartItem, getCart, modifyCart } from '../api/cart';
import { useRoute, useRouter } from 'vue-router';
import { useStore } from 'vuex';
export default {
  components: {
    navBar,
    sHeader,
  },
  setup() {
    const router = useRouter()
    const route = useRoute()
    const store = useStore()
    const state = reactive({
      list: [],
      result: [],
      checkAll: false
    });
    onMounted(() => {
        init()
    })
    const init = async () => {
        Toast.loading({massage: '加载中...', forbidClick: true})
        const { data } = await getCart({pageNumber: 1})
        console.log(data,'data')
        state.list = data
        state.result = data.map(item => item.cartItemId)
        Toast.clear()
    }
    const total = computed(() => {
        let sum = 0
        let _list = state.list.filter(item => state.result.includes(item.cartItemId))
        _list.forEach(item => {
            sum += item.goodsCount * item.sellingPrice
        })
        return sum
    })
    const allCheck = () => {
        if (!state.checkAll) {
            state.result = state.list.map(item => item.cartItemId)
        } else {
            state.result = []
        }
    }; // 全选
    const goTo = () => { //购物车为空时 去首页
        router.push({path: '/home'})
    };
    const onSubmit = () => {
        if (state.result.length == 0) {
            Toast.fail('请选择商品进行结算')
            return
        }
        const params = JSON.stringify(state.result)
        router.push({path: '/create-order', query: { cartItemIds: params }})
    }; // 提交
    const deleteGood = async (id) => {// 删除商品
        await deleteCartItem(id)
        store.dispatch('updateCart')
        init()
    }; 
    const onChange = async (value, detail) => {
        console.log(value,detail.name,'value detail')
        if(value > 5) {
            Toast.fail('超出单个商品最大购买数量')
            return
        }
        if(value < 1) {
            Toast.fail('商品数量不得小于一件')
            return
        }
        if (state.list.filter(item => item.cartItemId == detail.name)[0].goodsCount == value) return
        Toast.loading({massage: '修改中...', forbidClick: true})
        const params = {
            cartItemId: detail.name,
            goodsCount: value
        }
        await modifyCart(params)
        state.list.forEach(item => {
            if (item.cartItemId == detail.name) {
                console.log(item.cartItemId,detail.name)
                item.goodsCount = value
            }
        })
        Toast.clear()
    }; // 步进器 
    const groupChange = (result) => {
        if (result.length == state.list.length) {
            state.checkAll = true
        } else {
            state.checkAll = false
        }
        state.result = result
    }; // 集合变化
    return {
      ...toRefs(state),
      allCheck,
      goTo,
      onSubmit,
      deleteGood,
      onChange,
      groupChange,
      total
    };
  },
};
</script>

<style lang='less'>
@import "../common/style/mixin";
.cart-box {
  .cart-header {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 10000;
    .fj();
    .wh(100%, 44px);
    line-height: 44px;
    padding: 0 10px;
    .boxSizing();
    color: #252525;
    background: #fff;
    border-bottom: 1px solid #dcdcdc;
    .cart-name {
      font-size: 14px;
    }
  }
  .cart-body {
    margin: 60px 0 100px 0;
    padding-left: 10px;
    .good-item {
      display: flex;
      .good-img {
        img {
          .wh(100px, 100px);
        }
      }
      .good-desc {
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        flex: 1;
        padding: 20px;
        .good-title {
          display: flex;
          justify-content: space-between;
        }
        .good-btn {
          display: flex;
          justify-content: space-between;
          .price {
            font-size: 16px;
            color: red;
            line-height: 28px;
          }
          .van-icon-delete {
            font-size: 20px;
            margin-top: 4px;
          }
        }
      }
    }
    .delete-button {
      width: 50px;
      height: 100%;
    }
  }
  .empty {
    width: 50%;
    margin: 0 auto;
    text-align: center;
    margin-top: 200px;
    .empty-cart {
      width: 150px;
      margin-bottom: 20px;
    }
    .van-icon-smile-o {
      font-size: 50px;
    }
    .title {
      font-size: 16px;
      margin-bottom: 20px;
    }
  }
  .submit-all {
    margin-bottom: 50px;
    .van-checkbox {
      margin-left: 10px;
    }
    .van-submit-bar__text {
      margin-right: 10px;
    }
    .van-submit-bar__button {
      background: @primary;
    }
  }
  .van-checkbox__icon--checked .van-icon {
    background-color: @primary;
    border-color: @primary;
  }
}
</style>